Marine bifurcated bottom ship
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The present invention relates to improving the structure of the ship by means of fitting plural screws in series on the identical shaft generated by the diesel engine to augment the velocity in proceeding operation and bifurcating the bottom of said ship to reduce the water pressure on the prow thereof.

Tomoyasu, Yoshioki (Fujisawa-shi, JP)
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Primary Examiner:
Attorney, Agent or Firm:
Yoshioki Tomoyasu (Kanagawa-ken, JP)
1. The bottom of the ship is bifurcated in the form of ditch which is inclined at a certain of angle to decrease the water pressure in front of the prop of said ship by means of drawing fluid into said ditch resulting in lifting the hull to turn to propulsion.

2. The two screw are secured in series on the identical rotating shaft operated by the diesel engine to be supplemented with the force pushing blades of said front screw with the water pressure flowing through the inside of the water pipe and with the converging water flow brushed by among the blades of said front screw and other water flows divided on the prow flowing contour of the hull to strengthen the rotating force of the rear screw.

3. The inclined ditch fitted at the bottom of said ship is liable to flow fluid consecutively preventing the dynamic stress from being accumulated to throw up at the center of said ship by the moment of the resultant force constituted with the water pressure on the front of the prow and the proceeding force generated by the diesel engine which is liable to render said ship be wrecked.



The present invention is generally directed to developing for both higher speed and stable structure against the stronger dynamic stress imposed on the vessel with less fuel consumption than those of the conventional vessels in proceeding navigation.


The fast and stable navigation for the vessel is required for adapting specific corresponding countermeasure to the design in saving fuels and keeping safety.


The project ahead on the front crest line of the conventional vessel in profile is designed to deflect downwards the mass of the water flow to offset a reactive force acting stability against the excluded volume, which push water pressure upwards from bottom caused by structural dynamics produced between the water pressure in front of proceeding the vessel and the driving force generated by engine in rearwards, thus entailing heavy loss of energy. Whereas, it still remains behind as the countermeasure to prevent the dynamic stress from being distributed by moment into the central section of the vessel which is liable to render the ship to be wrecked.


The present invention is directed to develop for high efficiency in propulsion of the vessel by means of bifurcating the bottom of which crest line of the convergent walls with both sides from prow through stern constituted on the front sectional view in its profile is inclined in some angle at which sectional area diminish in scale down to the rear direction. As a result, the front water on proceeding vessel will creep into the ditch constituted with bifurcated bottom of thereof guiding the water-flow more steadily to offer lift to be turned to propelling power.

Furthermore, the present invention is directed to develop for saving fuels in navigation of said vessel by means of setting double screws on a single rotating shaft in series, one of the two screws is set at the inside cylinder of the water pipe laid from prow through stern of said vessel where laminar flow to assist the rotating operation generated by the diesel engine and another screw is installed at the rear of the stern thereof where confluence of the water flow continuously passing through among blades of said screw and the divided water on the prow flowing the contour of the hull converging to the stern is liable to strengthen rotating power of the screw fixed on the identical shaft.


FIG. 1: One example of the cross sectional view of the vessel illustrating for the two screws installed on the identical shaft with the front position at the inside of the pipe and at rear position of the outside of the stern of the vessel.

FIG. 2: One example of the front view of the invention illustrating ditch instituted at the bottom of the ship.

FIG. 3: One example of the sectional side view of the vessel applied bifurcated ditch at the bottom and the pipe from prow through stern of said vessel.


As shown FIG. 2, the present invention is directed to increasing stability and velocity of the ship (14) in propelling operation by means of bifurcating at the bottom (7) of said ship (14) forming the ditch (15) with inclined crest portion (8) laid from prow (16) to stern (5), of which sectional area become scale-down at the rearwards, thus fluid is liable to creep downwards to pass through the inside of said ditch (7) above the ground (12) and pushing said ship (14) upward with water pressure turning into propulsion.

Thus causing for lifting the position of the central weight as well as the draft line (6) of said ship (14) in collaboration with the water pipe (11) of which inside wall (10) allow to flow fluid smoothly laid from prow (16) through stern (5), the structure is liable to spread width and raise depth than those of the prior dimensions (13) of the ship (14) of which moment is declined against possible impact as well as dynamic stress occurred on the condition that sandwiched between the front pressure of the prop and the propelling force generated by diesel engine (4), presuming that the cargo (9) loading capacity may remain as unchanged

As shown FIG. 1 and FIG. 3 in addition to the above structure, the present invention is directed to augment the propulsion of said ship (14), double screws generated by diesel engine (4) are secured on the identical shaft in series, the front screw (2) is fitted inside of the water pipe (11) flowing fluid attaining the laminar flow to strengthen the rotating force and the rear screw (1) is installed at rear of the stern (5) to supplement the rotating operation with the water flow blushed by among rotating blades of first screw (2) and the water flow divided on said prow (16) flowing contour of the hull (3) converging to said stern (5).